We still keep a dummy BufferBuilder object around so that it can be used
for the builder error callback tests of the wire.
Change-Id: If0c502bb8b62ee3ed61815e34e9b6ee6c03a65ef
Resources used to have both a current and an allowed usage but the
concept of current usage has been removed so we can rename "allowed
usage" to "usage" to make the name match WebGPU's
WebGPUBufferDescriptor::usage and WebGPUTextureDescriptor::usage
Change-Id: I5190950bf7f7f5b86c92247ef0240fead9886268